Part of microsoft/vscode-internalbacklog#1709

Adjust references to --list-extensions option

Part of microsoft/vscode-internalbacklog#1709

This PR fixes #113831, see that issue fore a more detailed description.

This reverts commit 5d9e867a.

This changes makes a few changes to the openers:

- Move the opener prompting from the extension host into the main thread
- Make the external opener process two phases: get openers and then open. This would let us skip the trusted domain validation for extension handled links if we want to in the future
- Add lifecycle to commands used by the uri opener

For #109277

* Fix random focus lost issues on CTRL+1/2 for a webview

* Remove unnecessary null check

* Better way to handle blurring (so multiple webviews continue to work)

This change moves the extension uri opener contribution point to instead use the internal `IExternalOpener` api instead of the more generic `IOpener` api. This is required since external uri openers should see the resolved uri that has gone through port forwarding, not the raw uri that the user clicked on

We already have this event for electron based webviews

Part of #105446

#110226

This should make the call a little faster.

Partof #78438

Avoid timeouts in mirroring terminals to the extension host

fixes #110821